Facebook has used R to figure out that “just two data points are significantly predictive of whether a user remains on Facebook: (i) having more than one session as a new user, and (ii) entering basic profile information.”
For non-data-wonk professionals, R can make pretty pictures of complex information. Anyone capable of creating a spreadsheet can load that same sheet into R and begin playing with plots, charts, and graphs. This should not be undervalued: making a management presentation fraught with data (think: ad page sales by geography; segmented by industry; year-to-date; vs. last year-to-date) is a lot more palatable when there’s a stunning infograph in your deck.
Forbes is also crowdsourcing content for their January issue and is looking for graphs, charts and success stories about R. I've suggested the examples from the “R is Hot” series and the Revolution Analytics case studies, but I'm sure you have other great suggestions. Let Forbes know in their comments (Forbes.com registration required) or here.